| Event | Rank | Mark | By | Meet |
| B-400 | 1 | 46.24 | Montgomery, Kahmari (2015) (Plainfield Central, IL) (US#8) | IL 3A Boys State Finals(IL), 2015-05-30(#1) |
| | | National Elites above. State Elites below | | |
| B-400 | 2 | 48.27 | Strange, Steven (2016) (Oswego, IL) | IL 3A Plainfield North Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 3 | 49.69 | Carter, Jarvis (2016) (Plainfield East, IL) | Gans Zeedyk Invitational(IL), 2015-04-11(#1) |
| B-400 | 4 | 49.84 | Adams, Brandon (2018) (Minooka Community, IL) | USATF Youth National Championships 15-16(IL), 2015-07-05(#1) |
| B-400 | 5 | 50.82 | Glass, Christian (2015) (Plainfield East, IL) | Southwest Prairie Boys Conference Meet(IL), 2015-05-14(#3) |
| B-400 | 6 | 51.04 | Malinowski, Mike (2016) (Minooka Community, IL) | Southwest Prairie Boys Conference Meet(IL), 2015-05-14(#5) |
| B-400 | 7 | 51.10 | Arroyo, Aaron (2018) (Minooka Community, IL) | Belleville West Boys Invitational(IL), 2015-04-11(#7) |
| B-400 | 8 | 51.55 | Ruscitti, Alex (2015) (Plainfield North, IL) | Belleville West Boys Invitational(IL), 2015-04-11(#10) |
| B-400 | 9 | 51.82 | Moran, Luke (2016) (Oswego, IL) | Roger Wilcox Invitational(IL), 2015-05-01(#1) |
| B-400 | 10 | 51.85 | Deal, Austin (2016) (Plainfield South, IL) | USATF JO Region 7 Qualifier(IL), 2015-07-12(#1) |
| B-400 | 11 | 52.01 | Kiska, Mitchell (2017) (Plainfield East, IL) | IL 3A Plainfield North Boys Sectional(IL), 2015-05-21(#6) |
| B-400 | 12 | 52.02 | Loza, Luis (2015) (Romeoville, IL) | Terry Englund Relays(IL), 2015-04-23(#3) |
| B-400 | 13 | 52.12 | Ehringer, Brad (Plainfield South, IL) | Minooka Boys Invitational(IL), 2015-04-18(#6) |
| B-400 | 14 | 52.15 | Guzman, Cesar (2016) (Plainfield South, IL) | Wheaton North Best 4 Invitational(IL), 2015-04-11(#2) |
| B-400 | 15 | 52.18 | Pruett, Austin (Plainfield South, IL) | Southwest Prairie Boys Conference Meet(IL), 2015-05-14(#1) |
| B-400 | 16 | 52.22 | Turpin, Victor (2015) (Minooka Community, IL) | Minooka Boys Quad(IL), 2015-04-30(#1) |
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| | | See more performances for B-400 | | |
